Incorporation of Cascaded Metallic Gratings into Thin Film Solar Cells for Broadband Plasmonic Light Trapping
Plasmonic nanostructures have been regarded as a promising light trapping strategy towards boosting solarcell efficiency recently. However, the absorption enhancement stemming from surface plasmon excitations always suffers from an inherent limitation of narrow band widths, which may hamper the complete utilization of the solar radiation in a broadband spectrum for solar cells. In this paper, we theoretically show that by cascading metal gratings with different sizes atop the amorphous Silicon thin film solar cells (TFSCs), the enhanced light ab sorption band of the ultrathin active layer is extended due to the excitation of multiple localized surface plasmon resonances (LSPRs). For one-dimensional (1D) cascaded grating structure, the metallic gratings with different widths act as discrete nanoantennas which independently and efficiently collect the incoming photons at the LSPR wavelengths, leads to an enhancement of 60% in photocurrent for the TM-polarized incident illumination. Furthermore, it appears that both the coupling of plasmonic/photonic modes and their inter-coupling effects contribute to the light trapping in the 2D cascaded grating structures, which leads to an enhancement of 66.5% in the photocurrent over the bare TFSCs.
Long Wen Fuhe Sun Qin Chen
Key Laboratory of Nanodevices and Applications-CAS Collaborative Innovation Center of Suzhou Nano Science and Technology Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS) Suzhou 215123, China
国际会议
Progress in Electromagnetics Research Symposium 2014(2014年电磁学研究新进展学术研讨会)
广州
英文
1267-1271
2014-08-01（万方平台首次上网日期，不代表论文的发表时间）